Mechanical stoker.



PATENTED MAY 12, 1903.

P. J. HARLEMAN. MECHANICAL STOKER. APPLICATION BIL ED BEPT IS, 1901.

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- PATENTED MAY 12, 1903.

. P. J. HARLEMAN.

MECHANICAL STOKER.

APPLIOATION FILED SEPT. 16, 1901.

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W ..l W w 1 N No. 727,940- PATENTED MAY 12, 1903.

' P. J. HARLEMAN. MECHANICAL STOKER-i APPLICATION FILED SEPT. 16, 1901.

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NO MODEL.

No. 727,940. PATENTED' MAY 12, 1903. I P. J. HARLEMAN.

MECHANICAL STOKE-R.

AIPLIOATION FILED saw. 16. 1901.

.no MODEL.

v PATENTED MAY 12, 1903 P."J. HARLEMAN.

MECHANICAL STOKER.

APPLICATION FILED SEPT. 16, 1901.

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no MODEL.

NITED STATES Patented May 12 1903.

PATENT FFIGE.

MECHANICAL STOKER SPECIFICATION forming part of Letters Fatent No. 727,940, dated May 12, 1903.

Application filed September 16, 1901. Serial No. 75,643. (No model.) I

To aZZ whom it may concern.-

Be it known that I, PETER J. HARLEMAN, of Boston, in the county of Suffolk and State of Massachusettahave invented certain new and useful Improvements inMechanicalStokers, of which the following is a specification.

My invention relates to new and useful improvements in mechanical stokers; and its object is to, first, obtain the greatest number of heat units by facilitating the combustion of the fuel; second, to adjust the grate to different positions best adapted for different grades of fuel, and, lastly, to prolong the life of the grate.

My invention consists of certain novel features hereinafter described, and particularly pointed out in the claims.

In the accompanying drawings, which illustrate a construction embodying my invention, Figure l is a front view of a furnace with parts in section. Fig. 2 is a side view of the furnace and grate with one of the side walls removed. Fig. 3 is a sectionalview through the grate. Fig. 4 is a view looking from the lower end of the grate with parts in section to illustrate construction. Fig. 5 is a detail sectional View on the line XI XI, Fig. 7. Fig. 6 is a detail view of one end of the grate-bar, showing the ratchet. Fig. 7 is a side View of one of the grate-bars, partly broken away to show the interior arrangement. Fig. 8 is a detailed sectional view of certain mechanism for causing the rotation of the grate-bars. Fig. 9 is a detail side View of a modified grate-bar. Fig. 10 is an end view of one of the sections of the grate-bar shown in Fig. 9.

transverse pairs of rollers M mounted in the upper end of the standards M secured by suitable bolts to the angle-irons M M M (See Fig. 4..) The opposite angle-irons M M are connected together by the cross-irons M and M which are bolted at each end to the said angle-irons, and the middle iron M is secured to said c ross-ironsl\/I and M by means of which all three of the angle-irons are held firmly in position. The angle-irons M and M are pivoted at M on the standards A and A resting on the base A, so that said grate E can be adjusted to any position,as indicated in dotted lines, for different grades of coal. The lever His pivoted to the link K which in turn is pivoted on the angle-iron M at K, and its opposite end is pivoted at K to the link K and between the links K and K is pivoted the lever K at K and said link K is pivoted at K in a depending lug on the angle-iron M, and to the lower end of the link K is. pivoted at K thelever K (See Figs. 1, 2, and 8.) The lever K extends forwardly and ispivoted to the link H, which is suitably pivoted at H in the front wall and at its upper end to the lever H, so

' that these levers when operated move in opposite directions. This lever K extends forwardly and is pivoted at K to the bell-crank lever K", to which is connected at K the lower end of the rod K operated by an eccentric L, driven by the shaft L, on which is mounted a fast and a loose pulley L and U, with the fast one of which the belt L is adapted to engage and operate the rod K".

The arrangement of the lever H, links K and K and lever K, as previously described in detail, distributes the strain pro-' of the lever K the lever K moves forwardly heat than another, each part of the surface of the grate-bars being brought from time to time to the top, and the part removed from contact with the fuel is cooled by the air passing through the grate-bars, and the air being heated by contact with the grate-bars facilitates the combustion of the fuel.

Opposite the end of each grate-bar is an opening A which is closed by the cap A and through said opening steam may be passed in order to clean out the grate-bars, or, if desired, air can be admitted through said openings; but ordinarily the air is admitted through the front doors and passes up into the grate-bars through the lower openings and out through the upper openings, thereby cooling the lower portions of the grate-bars, and is heated to facilitate combustion.

Located on the bottom of each grate and pivoted at N on the angle-irons M M M there are located four dumping-grates N of the usual construction, having a rear plate N and each dumping-grate is pivoted at N to a lever N which is normally held in the position shown in full lines, Fig. 3, by the latch N \Vhen it is desired to dump these grates to remove the ashes and clinkers, the fireman, opening the doors and taking hold of the handles N located opposite each door, can operate one or more of these levers in succession and move the same to the position shown in dotted lines, Fig. 3, so that the ashes and clinkers will be dumped to the bottom of the furnace. To the lever N is pivotally connected at N the arm N which is pivoted on a stud N, extending down from the angle-iron M as shown in Fig. 3.

It is desirable to change the location of the grate for different grades of coal, and for this purpose I have provided means for moving the front end of the grate-bar up and down, as shown in the full lines and dotted lines, Figs. 2 and 3, and to this end have connected chains 0 to the lugs 0, (see dotted lines, Fig. 1,) and the upper ends of the chains pass around the drums O on the shaft 0 and on one end of the shaft beyond the drum is the gear-wheel O, with which works the wormgear 0 and by operating the handle 0 the location of the grate-bars F of the grate E can be varied.

Thecoal or fuel is placed in the hopper P, and the amount passing from the hopper onto the grate is controlled by the gate P, which on one side is provided with lugs P (see dotted lines, Fig. 3,) located around the screwthreaded shafts P which at their lower ends have a bearing P one of which is shown in dotted lines, Fig. 1, and the upper end of each of said screw-threaded shafts is provided with a bevel-gear P, Fig. 1, with each of which is adapted to engage a bevel-gear P fast on the shaft P mounted in suitable supports, and on one end of said shaft is located a bevel-gear P with which is adapted to engage another bevel-gear P and by operating the handle Q, the position of the gate P can be varied with respect to the amount of opening between the hopper and the grate. In the lower end of the hopper is located the feed-wheel R, mounted on a shaft R, journaled in the lower opposite sides of the hopper. This feed-wheel Ris operated by the rod R, secured at R to the rod K", and connected to the said lower end of the said red It is the lever R carrying the pawl R which is held inwardly by a spring R and adapted to engage with the teeth of the ratchet R on one end of the shaft R outside the hopper.

Within each grate-bar F is located a tumbler T, having three cars U, two of which are adapted to engage with the adjacent openings S of the lower part of the grate-bar, and the object of this tumbler is to provide means for forcing out from the openings S cinders or ashes which may clog therein, so that as the grate-bars turn the tumbler falls by gravity into the next two adjacent openings, and this operation continues as the grate revolves, the tumbler turning and occupying two of the openings at a time, as shown in Fig. 5.

The front of the furnace has the usual wall B", provided with the usual doors B Referring to Figs. 9 and 10, which illustrate a modification, a number of ring-sections F are arranged together, and through said sections pass the rods F on which the ringsections are strung. Each section is provided with a number of shoulders F having lugs F which fit into recesses F in the corresponding lugs of the ring-sections adjacent. The spaces S between the ring-sections allow the movement of air through the grate E. Located in the bottom of the grate within the ring-sections is a tumbler T, having three ears U, which operate to clean out the spaces S between the ring-sections F in the rotation of the grate.

I do not limit myself to the arrangement and construction shown, as the same may be varied without departing from the spirit of my invention.

Having thus described the nature of my in vention and set forth a construction embodying the same, what I claim as new, and desire to secure by Letters Patent of the United States, is-

1. In an apparatus of the character described, a grate consisting of a series of hollow perforated grate-bars, mechanism for retating said grate-bars, and a device having ears which are adapted to pass into the perforations of the grate-bars and thereby prevent clogging of the same.

2. In an apparatus of thecharacter described, a grate consisting of a series of hollow perforated grate-bars, mechanism for rotating said grate-bars, and a device operated by gravity and having ears which are adapted to pass into the perforations of the grate-bars and thereby prevent clogging of the same.

3. In an apparatus of the character de scribed, a grate consisting of a series of hollow perforated grate-bars, mechanism for rotating said grate-bars, and a device in each of said grate-bars and having ears which are adapted to pass into the perforations of the grate-bars and thereby prevent clogging of the same. 7

4. In an apparatus of the character described, a grate consisting of a series of hollow perforated grate-bars, mechanism for retating said grate-bars, and a device in each of said grate-bars operated by gravity and having cars which are adapted to pass into the perforations of the grate-bars and thereby prevent clogging of the same.

5. In an apparatus of the character described, a grate consisting of a series of hollow grate-bars, a ratchet on each grate-bar, a series of weighted pawls adapted to engage with said ratchets, a lever to which said pawls are pivoted for operating said pawls to move the grate-bars and to return said pawls to engage another tooth of the ratchets for the next movement of the grate-bars, another lever connected to the lever carrying the weighted pawls, links at both ends pivoted on an angle-iron to which said levers are pivoted, a third lever for operating said levers, a link pivoted on an angle-iron and connecting said third lever with the other two levers, a bellcrank pivoted to said last lever, and automatic mechanism for operating said bellcrank lever to produce a reciprocating motion of the grate-bar carrying the weighted pawls.

6. In an apparatus of the character described, a grate consisting of a series of hollow perforated grate-bars, a ratchet on each grate-bar, a series of weighted pawls adapted to engage with said ratchets, a lever to which said pawls are pivoted for operating said pawls to move the grate-bars and to return said pawls to engage another tooth of the ratchets for the next movement of the gratebars, another lever connected to the lever carrying the weighted pawls, links at both ends pivoted on an angle-iron to which said levers are pivoted, a third lever for operating said levers, a link pivoted on an angleiron and connecting said third lever with the other two levers, a bell-crank pivoted to said last lever, and automatic mechanism for opv another tooth of the ratchets for the next movement of the grate-bars, another lever connected to the lever carrying the weighted pawls, links atboth ends pivoted on an angle-iron'to which said levers are pivoted, a 7

third lever for operating said levers, a link pivoted on an angle-iron and connecting said third lever with the other two levers, a bellcrank pivoted to said last lever, and automatic mechanism for operating said bellcrank to produce a reciprocating motion of the grate-bar carrying the weighted pawls.

In testimony whereof I have signed my name to this specification, in the presence of two subscribing witnesses, this 28th day of August, A. D. 1901.

PETER J. HARLEMAN.

Witnesses:

FRANK B. FORREST, A. RUSSELL BARNES. 

